Improved superconducting properties of MgB2 thin films fabricated by ultrasonic spray pyrolysis method at high temperature
Küçük Resim Yok
Tarih
2012
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Sci Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
High quality MgB2 superconducting thin films have been successfully prepared by 2.4 MHz ultrasonic spray pyrolysis (USP) system on single crystal Al2O3 (001) substrates. The microstructure, electrical and magnetic properties of approximately 500-600 nm thick films were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) in conjunction with the energy dispersive X-ray analysis (EDX), resistance versus temperature (R-T) and magnetization measurements (M-H) under different magnetic fields and transport critical current density (J(c)). Films were first heat treated in situ in the spraying chamber with an extra Mg powder during deposition to compensate excess evaporation of Mg from the films and then additionally heat treated in Ar atmosphere at 700 degrees C for a short time. According to the results obtained, orientation on any particular direction for the crystal growth was not seen. Homogeneous, highly dense and highly smooth surface morphology and low resistance have been achieved under optimum conditions. Optimally treated films exhibited relatively high transport critical current density of 2.37 x 10(5) A cm(-2). These results have been also compared with the J(c)(mag) results calculated from the M-H curves. The electrical resistance property of the best samples was obtained to be 39.5 and 37.4 K for T-c and T-zero, respectively. (C) 2012 Elsevier Ltd. All rights reserved.
Açıklama
6th Asian Conference on Applied Superconductivity and Cryogenics (ACASC) -- NOV 16-18, 2011 -- Delhi, INDIA
Anahtar Kelimeler
Ultrasonic spray pyrolysis (USP), Superconducting thin film, MgB2
Kaynak
Cryogenics
WoS Q Değeri
Q2
Scopus Q Değeri
Q2
Cilt
52
Sayı
12
